COMPLEXITY   THEORY                   SOFTWARE                             DEVELOPMENT                     and            ...
Agents                                         Landscapes       Emergence                            Complexity           ...
AgentsWednesday, October 17, 12            3
Agents are...                  Simple                   Interactive                        AdaptiveWednesday, October 17, ...
Why Does                            TRAFFIC                                       Jam?Wednesday, October 17, 12           ...
Stuck                                in           TRAFFIC                                                                 ...
Stuck                                 TRAFFIC                                in                                      maniA...
Net                                                  LOGO                            http://ccl.northwestern.edu/netlogo/W...
Net                                  LOGOWednesday, October 17, 12                9
Net                                                            LOGO         Flocking                            Alignment:...
Net                                  LOGOWednesday, October 17, 12                11
Agents                                         Landscapes       Emergence                            Complexity           ...
LandscapesWednesday, October 17, 12           13
Think of a                       Problem                            as a            SURFACEWednesday, October 17, 12      ...
MT. FUJIWednesday, October 17, 12    15
Frederick                                 Winslow                            TAYLORWednesday, October 17, 12              ...
RUGGED                            LANDSCAPESWednesday, October 17, 12                17
Dancing                            LANDSCAPESWednesday, October 17, 12                18
Agents                                         Landscapes       Emergence                            Complexity           ...
CriticalityWednesday, October 17, 12                 20
the           Normal         DISTRIBUTIONWednesday, October 17, 12        21
the          Power Law         DISTRIBUTIONWednesday, October 17, 12          22
Wednesday, October 17, 12                            Rice   PILES   23
Work                             LOADWednesday, October 17, 12           24
Work                             LOADWednesday, October 17, 12           25
Work                             LOADWednesday, October 17, 12           26
Work                             LOADWednesday, October 17, 12           27
Work                             LOADWednesday, October 17, 12           28
Work                             LOADWednesday, October 17, 12           29
Work                             LOADWednesday, October 17, 12           30
Work                             LOADWednesday, October 17, 12           31
Work                             LOADWednesday, October 17, 12           32
Work                             LOADWednesday, October 17, 12           33
Too much                    Utilization        leads to   CRITICALITYWednesday, October 17, 12                         34
Agents                                         Landscapes       Emergence                            Complexity           ...
ConnectednessWednesday, October 17, 12   36
A really basic refresher in                            Graph        THEORY              Seriously...BASIC.Wednesday, Octob...
Degree 5                                       Degree 1                            Degree 4Wednesday, October 17, 12      ...
To here   From here                    Path Length=   3Wednesday, October 17, 12                    39
Network        FUNCTIONALITYWednesday, October 17, 12   40
Information           DIFFUSION        depends on Path LengthWednesday, October 17, 12                            41
Robustness                                  to       FAILURE              depends on degree distributionWednesday, October...
Agents                                         Landscapes       Emergence                            Complexity           ...
EmergenceWednesday, October 17, 12         44
SlimeWednesday, October 17, 12                            MOLD     45
Slime Mold EmergenceWednesday, October 17, 12               46
Conway’s                      Game                            ofWednesday, October 17, 12                            LIFE ...
Gameof                             Conway’s                                                       LIFE                    ...
Wednesday, October 17, 12   49
Wednesday, October 17, 12   50
Wednesday, October 17, 12   51
Surprise!                            it’s a                                     COMPUTERWednesday, October 17, 12         ...
Von Neumann                    ARCHITECTUREWednesday, October 17, 12          53
Wednesday, October 17, 12   54
Wednesday, October 17, 12   55
Ant                  COLONIESWednesday, October 17, 12         56
Wednesday, October 17, 12   57
Proceed with          CAUTIONWednesday, October 17, 12                  58
Software               as a                            COMPLEX                             ProfessionWednesday, October 17...
AGENT-                             BASED                              DECISION                                MAKINGWednes...
Wednesday, October 17, 12   61
What kind of     Software      Architecture          would look like an                              ANTWednesday, October...
Wednesday, October 17, 12   63
Wednesday, October 17, 12   64
Hypertext                          as the     Engine                                of       APPLICATION            STATE ...
the way                                        HATEOAS                                       Works                        ...
HATEOAS                                 the way                                     Works                       Service   ...
HATEOAS                                 the way                                      Works                                ...
HATEOAS                                 the way                                     Works                       Service   ...
Make me a                                                                   Add Toppings                     Sandwich     ...
REST  done      RIGHTWednesday, October 17, 12   71
Class                                Are your                            Dependencies   like a        RICE PILE?Wednesday,...
Afferent          COUPLING                 A classs afferent coupling is a measure of how many                 other class...
remember the           Power Law                            DISTRIBUTIONWednesday, October 17, 12                  74
grails-web                            900                            675                            450                   ...
Hibernate 3                            1500                            1125                            750                ...
Spring 3 Core                            300                            225                            150                ...
toward a                            COMPLEX           THEORY               of    SOFTWARE                    DEVELOPMENTWe...
Agents                                         Landscapes       Emergence                            Complexity           ...
Thank You                             Tim Berglund                              tlberglund@github.com                     ...
ACKNOWLEDGMENTS                            http://bit.ly/unde                                              rstanding-compl...
Photo Credits     Slime Mold Cells     http://campus.queens.edu/faculty/jannr/Botany/images/slimies/slimeMolds/slimeMold11...
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Complexity theory and software development : Tim Berglund

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Some systems are too large to be understood entirely by any one human mind. They are composed of a diverse array of individual components capable of interacting with each other and adapting to a changing environment. As systems, they produce behavior that differs in kind from the behavior of their components. Complexity Theory is an emerging discipline that seeks to describe such phenomena previously encountered in biology, sociology, economics, and other disciplines. Beyond new ways of looking at ant colonies, fashion trends, and national economies, complexity theory promises powerful insights to software development. The Internet—perhaps the most valuable piece of computing infrastructure of the present day—may fit the description of a complex system. Large corporate organizations in which developers are employed have complex characteristics. In this session, we'll explore what makes a complex system, what advantages complexity has to offer us, and how to harness these in the systems we build.

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Complexity theory and software development : Tim Berglund

  1. 1. COMPLEXITY THEORY SOFTWARE DEVELOPMENT and @tlberglundWednesday, October 17, 12 1
  2. 2. Agents Landscapes Emergence Complexity Criticality ConnectednessWednesday, October 17, 12 2
  3. 3. AgentsWednesday, October 17, 12 3
  4. 4. Agents are... Simple Interactive AdaptiveWednesday, October 17, 12 4
  5. 5. Why Does TRAFFIC Jam?Wednesday, October 17, 12 5
  6. 6. Stuck in TRAFFIC Talking on cell phone, not paying attention... I sure am in all this a hurry! space! Ima speed up.Wednesday, October 17, 12 6
  7. 7. Stuck TRAFFIC in maniAc! Oh, my bad. @%$#%!Wednesday, October 17, 12 7
  8. 8. Net LOGO http://ccl.northwestern.edu/netlogo/Wednesday, October 17, 12 8
  9. 9. Net LOGOWednesday, October 17, 12 9
  10. 10. Net LOGO Flocking Alignment: a bird tends to move in the same direction of nearby birds. Separation: a bird will turn to avoid another bird if they get too close. Cohesion: a bird will tend to move towards other nearby birds.Wednesday, October 17, 12 10
  11. 11. Net LOGOWednesday, October 17, 12 11
  12. 12. Agents Landscapes Emergence Complexity Criticality ConnectednessWednesday, October 17, 12 12
  13. 13. LandscapesWednesday, October 17, 12 13
  14. 14. Think of a Problem as a SURFACEWednesday, October 17, 12 14
  15. 15. MT. FUJIWednesday, October 17, 12 15
  16. 16. Frederick Winslow TAYLORWednesday, October 17, 12 16
  17. 17. RUGGED LANDSCAPESWednesday, October 17, 12 17
  18. 18. Dancing LANDSCAPESWednesday, October 17, 12 18
  19. 19. Agents Landscapes Emergence Complexity Criticality ConnectednessWednesday, October 17, 12 19
  20. 20. CriticalityWednesday, October 17, 12 20
  21. 21. the Normal DISTRIBUTIONWednesday, October 17, 12 21
  22. 22. the Power Law DISTRIBUTIONWednesday, October 17, 12 22
  23. 23. Wednesday, October 17, 12 Rice PILES 23
  24. 24. Work LOADWednesday, October 17, 12 24
  25. 25. Work LOADWednesday, October 17, 12 25
  26. 26. Work LOADWednesday, October 17, 12 26
  27. 27. Work LOADWednesday, October 17, 12 27
  28. 28. Work LOADWednesday, October 17, 12 28
  29. 29. Work LOADWednesday, October 17, 12 29
  30. 30. Work LOADWednesday, October 17, 12 30
  31. 31. Work LOADWednesday, October 17, 12 31
  32. 32. Work LOADWednesday, October 17, 12 32
  33. 33. Work LOADWednesday, October 17, 12 33
  34. 34. Too much Utilization leads to CRITICALITYWednesday, October 17, 12 34
  35. 35. Agents Landscapes Emergence Complexity Criticality ConnectednessWednesday, October 17, 12 35
  36. 36. ConnectednessWednesday, October 17, 12 36
  37. 37. A really basic refresher in Graph THEORY Seriously...BASIC.Wednesday, October 17, 12 37
  38. 38. Degree 5 Degree 1 Degree 4Wednesday, October 17, 12 38
  39. 39. To here From here Path Length= 3Wednesday, October 17, 12 39
  40. 40. Network FUNCTIONALITYWednesday, October 17, 12 40
  41. 41. Information DIFFUSION depends on Path LengthWednesday, October 17, 12 41
  42. 42. Robustness to FAILURE depends on degree distributionWednesday, October 17, 12 42
  43. 43. Agents Landscapes Emergence Complexity Criticality ConnectednessWednesday, October 17, 12 43
  44. 44. EmergenceWednesday, October 17, 12 44
  45. 45. SlimeWednesday, October 17, 12 MOLD 45
  46. 46. Slime Mold EmergenceWednesday, October 17, 12 46
  47. 47. Conway’s Game ofWednesday, October 17, 12 LIFE 47
  48. 48. Gameof Conway’s LIFE 1. Any live cell with fewer than two live neighbours dies. 2. Any live cell with more than three live neighbours dies. 3. Any live cell with two or three live neighbors lives. 4. Any dead cell with exactly three live neighbors comes to life.Wednesday, October 17, 12 48
  49. 49. Wednesday, October 17, 12 49
  50. 50. Wednesday, October 17, 12 50
  51. 51. Wednesday, October 17, 12 51
  52. 52. Surprise! it’s a COMPUTERWednesday, October 17, 12 52
  53. 53. Von Neumann ARCHITECTUREWednesday, October 17, 12 53
  54. 54. Wednesday, October 17, 12 54
  55. 55. Wednesday, October 17, 12 55
  56. 56. Ant COLONIESWednesday, October 17, 12 56
  57. 57. Wednesday, October 17, 12 57
  58. 58. Proceed with CAUTIONWednesday, October 17, 12 58
  59. 59. Software as a COMPLEX ProfessionWednesday, October 17, 12 59
  60. 60. AGENT- BASED DECISION MAKINGWednesday, October 17, 12 60
  61. 61. Wednesday, October 17, 12 61
  62. 62. What kind of Software Architecture would look like an ANTWednesday, October 17, 12 COLONY? 62
  63. 63. Wednesday, October 17, 12 63
  64. 64. Wednesday, October 17, 12 64
  65. 65. Hypertext as the Engine of APPLICATION STATE http://bit.ly/HATEOASWednesday, October 17, 12 65
  66. 66. the way HATEOAS Works GET /sandwich Service Web ServiceWednesday, October 17, 12 66
  67. 67. HATEOAS the way Works Service 400 ERROR <link rel=”bread” /> <link rel=”ingredient” /> Web ServiceWednesday, October 17, 12 67
  68. 68. HATEOAS the way Works POST /sandwich bread=rye Service meat=pastrami Web ServiceWednesday, October 17, 12 68
  69. 69. HATEOAS the way Works Service 201 OK <link href=”sandwich”> <link href=”eat” /> <link href=”side” /> Web ServiceWednesday, October 17, 12 69
  70. 70. Make me a Add Toppings Sandwich I make Give me a sandwiches. sandwich, and I can decorate it with toppings. I exchange sandwiches I toast Federal for sandwichReserve buns.Notes. Checkout Toast BunWednesday, October 17, 12 70
  71. 71. REST done RIGHTWednesday, October 17, 12 71
  72. 72. Class Are your Dependencies like a RICE PILE?Wednesday, October 17, 12 72
  73. 73. Afferent COUPLING A classs afferent coupling is a measure of how many other classes are coupled to it through method calls, field accesses, inheritance, arguments, return types, and exceptions.Wednesday, October 17, 12 73
  74. 74. remember the Power Law DISTRIBUTIONWednesday, October 17, 12 74
  75. 75. grails-web 900 675 450 225 0Wednesday, October 17, 12 75
  76. 76. Hibernate 3 1500 1125 750 375 0Wednesday, October 17, 12 76
  77. 77. Spring 3 Core 300 225 150 75 0Wednesday, October 17, 12 77
  78. 78. toward a COMPLEX THEORY of SOFTWARE DEVELOPMENTWednesday, October 17, 12 78
  79. 79. Agents Landscapes Emergence Complexity Criticality ConnectednessWednesday, October 17, 12 79
  80. 80. Thank You Tim Berglund tlberglund@github.com @tlberglundWednesday, October 17, 12 80
  81. 81. ACKNOWLEDGMENTS http://bit.ly/unde rstanding-compl exityWednesday, October 17, 12 81
  82. 82. Photo Credits Slime Mold Cells http://campus.queens.edu/faculty/jannr/Botany/images/slimies/slimeMolds/slimeMold1152.jpg Car Top View http://www.motiontrends.com/2006/m09/Volvo/C30.shtml Ants http://www.flickr.com/photos/binux/2495709841 Traffic Jam http://www.flickr.com/photos/lynac/321100379/ Turning Machine http://www.ecs.syr.edu/faculty/fawcett/handouts/webpages/CoreTechnologies.htm VonNeumann Machine http://en.wikipedia.org/wiki/File:Von_Neumann_architecture.svg Ant Colony http://www.bioone.org/doi/full/10.1672/1536-2442%282004%29004%5B0001%3ATNAOTF%5D2.0.CO%3B2 Mt. Fuji http://www.flickr.com/photos/mtsn/229410448 Snowy Mountains http://www.flickr.com/photos/huzhead/85362599 Portrait of Frederick Winslow Taylor http://upload.wikimedia.org/wikipedia/commons/9/90/Frederick_Winslow_Taylor_crop.jpg Female Velvet Ant (in Work Load Illustration) http://www.flickr.com/photos/markop/1036891509 Frederick Hayek http://www.lancs.ac.uk/staff/ecagrs/Hayek%20quotes.htmWednesday, October 17, 12 82

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